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October 2001

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Subject:
From:
Werner Engelmaier <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Sun, 15 Jul 2001 16:09:36 EDT
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Hi Joe,
>1) IS THIS 30 DEGREE ANGLE A REAL PROBLEM ?
Without actually seeing your design and the failures, one cannot say for
sure. However, the angle is not likely to be the or evan a part of the
problem.
>2)IS THERE POSSIBLY MORE THAT I SHOULD BE LOOKING AT?
Yes. What is the failure mode--through the solder or interfacial? How long is
the hot bar tool? Where along the tool contact length are the failures? Are
they typically at the same location? When are the failures occurring? How are
the SJs loaded--CTE-mismatch, vibrationn, mechanical shock, cyclic or
steady-state?
>3)IS THERE A WAY OF SOLVING THIS PROBLEM WITHOUT MOVING THE COMPONENTS?
Possibly, but without having any of the details i cannot be sure.

Werner Engelmaier
Engelmaier Associates, L.C.
Electronic Packaging, Interconnection and Reliability Consulting
7 Jasmine Run
Ormond Beach, FL  32174  USA
Phone: 904-437-8747, Fax: 904-437-8737
E-mail: [log in to unmask], Website: www.engelmaier.com

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